fix(review): address Copilot PR feedback

- Add compile-time interface assertion for sessionWindowMockRepo
- Fix flaky fallback test by capturing time.Now() before calling UpdateSessionWindow
- Replace stale hardcoded timestamps with dynamic future values
- Add millisecond detection and bounds validation for reset header timestamp
- Use pause/resume pattern for interval in UsageProgressBar to avoid idle timers on large lists
- Fix gofmt comment alignment

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/internal/service/ratelimit_service.go

@@ -1054,14 +1054,26 @@ func (s *RateLimitService) UpdateSessionWindow(ctx context.Context, account *Acc
 	// 优先使用响应头中的真实重置时间（比预测更准确）
 	if resetStr := headers.Get("anthropic-ratelimit-unified-5h-reset"); resetStr != "" {
 		if ts, err := strconv.ParseInt(resetStr, 10, 64); err == nil {
+			// 检测可能的毫秒时间戳（秒级约为 1e9，毫秒约为 1e12）
+			if ts > 1e11 {
+				slog.Warn("account_session_window_header_millis_detected", "account_id", account.ID, "raw_reset", resetStr)
+				ts = ts / 1000
+			}
 			end := time.Unix(ts, 0)
-			// 窗口需要初始化，或者真实重置时间与已存储的不同，则更新
-			if needInitWindow || account.SessionWindowEnd == nil || !end.Equal(*account.SessionWindowEnd) {
+			// 校验时间戳是否在合理范围内（不早于 5h 前，不晚于 7 天后）
+			minAllowed := time.Now().Add(-5 * time.Hour)
+			maxAllowed := time.Now().Add(7 * 24 * time.Hour)
+			if end.Before(minAllowed) || end.After(maxAllowed) {
+				slog.Warn("account_session_window_header_out_of_range", "account_id", account.ID, "raw_reset", resetStr, "parsed_end", end)
+			} else if needInitWindow || account.SessionWindowEnd == nil || !end.Equal(*account.SessionWindowEnd) {
+				// 窗口需要初始化，或者真实重置时间与已存储的不同，则更新
 				start := end.Add(-5 * time.Hour)
 				windowStart = &start
 				windowEnd = &end
 				slog.Info("account_session_window_from_header", "account_id", account.ID, "window_start", start, "window_end", end, "status", status)
 			}
+		} else {
+			slog.Warn("account_session_window_header_parse_failed", "account_id", account.ID, "raw_reset", resetStr, "error", err)
 		}
 	}
 

backend/internal/service/ratelimit_session_window_test.go

@@ -19,6 +19,8 @@ type sessionWindowMockRepo struct {
 	clearRateLimitIDs  []int64
 }
 
+var _ AccountRepository = (*sessionWindowMockRepo)(nil)
+
 type swCall struct {
 	ID     int64
 	Start  *time.Time
@@ -160,7 +162,7 @@ func newRateLimitServiceForTest(repo AccountRepository) *RateLimitService {
 func TestUpdateSessionWindow_UsesResetHeader(t *testing.T) {
 	// The reset header provides the real window end as a Unix timestamp.
 	// UpdateSessionWindow should use it instead of the hour-truncated prediction.
-	resetUnix := int64(1771020000) // 2026-02-14T10:00:00Z
+	resetUnix := time.Now().Add(3 * time.Hour).Unix()
 	wantEnd := time.Unix(resetUnix, 0)
 	wantStart := wantEnd.Add(-5 * time.Hour)
 
@@ -203,6 +205,11 @@ func TestUpdateSessionWindow_FallbackPredictionWhenNoResetHeader(t *testing.T) {
 	headers.Set("anthropic-ratelimit-unified-5h-status", "allowed_warning")
 	// No anthropic-ratelimit-unified-5h-reset header
 
+	// Capture now before the call to avoid hour-boundary races
+	now := time.Now()
+	expectedStart := time.Date(now.Year(), now.Month(), now.Day(), now.Hour(), 0, 0, 0, now.Location())
+	expectedEnd := expectedStart.Add(5 * time.Hour)
+
 	svc.UpdateSessionWindow(context.Background(), account, headers)
 
 	if len(repo.sessionWindowCalls) != 1 {
@@ -214,9 +221,6 @@ func TestUpdateSessionWindow_FallbackPredictionWhenNoResetHeader(t *testing.T) {
 		t.Fatal("expected window end to be set (fallback prediction)")
 	}
 	// Fallback: start = current hour truncated, end = start + 5h
-	now := time.Now()
-	expectedStart := time.Date(now.Year(), now.Month(), now.Day(), now.Hour(), 0, 0, 0, now.Location())
-	expectedEnd := expectedStart.Add(5 * time.Hour)
 
 	if !call.End.Equal(expectedEnd) {
 		t.Errorf("expected fallback end %v, got %v", expectedEnd, *call.End)
@@ -229,7 +233,7 @@ func TestUpdateSessionWindow_FallbackPredictionWhenNoResetHeader(t *testing.T) {
 func TestUpdateSessionWindow_CorrectsStalePrediction(t *testing.T) {
 	// When the stored SessionWindowEnd is wrong (from a previous prediction),
 	// and the reset header provides the real time, it should update the window.
-	staleEnd := time.Now().Add(2 * time.Hour) // existing prediction: 2h from now
+	staleEnd := time.Now().Add(2 * time.Hour)             // existing prediction: 2h from now
 	realResetUnix := time.Now().Add(4 * time.Hour).Unix() // real reset: 4h from now
 	wantEnd := time.Unix(realResetUnix, 0)
 
@@ -291,7 +295,7 @@ func TestUpdateSessionWindow_NoUpdateWhenHeaderMatchesStored(t *testing.T) {
 
 func TestUpdateSessionWindow_ClearsUtilizationOnWindowReset(t *testing.T) {
 	// When needInitWindow=true and window is set, utilization should be cleared.
-	resetUnix := int64(1771020000)
+	resetUnix := time.Now().Add(3 * time.Hour).Unix()
 
 	repo := &sessionWindowMockRepo{}
 	svc := newRateLimitServiceForTest(repo)

frontend/src/components/account/UsageProgressBar.vue

@@ -56,7 +56,7 @@
 </template>
 
 <script setup lang="ts">
-import { computed, ref } from 'vue'
+import { computed, ref, watch } from 'vue'
 import { useIntervalFn } from '@vueuse/core'
 import { useI18n } from 'vue-i18n'
 import type { WindowStats } from '@/types'
@@ -72,11 +72,28 @@ const props = defineProps<{
 
 const { t } = useI18n()
 
-// Reactive clock for countdown (updates every 60s)
+// Reactive clock for countdown — only runs when a reset time is shown,
+// to avoid creating many idle timers across large account lists.
 const now = ref(new Date())
-useIntervalFn(() => {
-  now.value = new Date()
-}, 60_000)
+const { pause: pauseClock, resume: resumeClock } = useIntervalFn(
+  () => {
+    now.value = new Date()
+  },
+  60_000,
+  { immediate: false },
+)
+if (props.resetsAt) resumeClock()
+watch(
+  () => props.resetsAt,
+  (val) => {
+    if (val) {
+      now.value = new Date()
+      resumeClock()
+    } else {
+      pauseClock()
+    }
+  },
+)
 
 // Label background colors
 const labelClass = computed(() => {